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2 years ago

2-16x2 + 32x = 0 Solving quadratics 2 (a=1)

Mathematics

1 answer:

Strike441 [17]2 years ago

7 0

Answer:

Step-by-step explanation:

-16x^2 + 32x + 2 = 0

Using the quadratic formula:

x = [-32 +/- sqrt((32^2 - 4*-16*2) / (2*-16)

= 1 +/- sqrt (1152)/(-32)

= -0.06, 2.06.

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3 years ago

Solve x 2 + 8x + 7 = 0 {-1,-7) {1,7) 00

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3 years ago

A survey of 80 randomly selected companies asked them to report the annual income of their presidents. Assuming that incomes are

Artyom0805 [142]

Answer:

The 90% confidence interval estimate of the mean annual income of all company presidents is ($579,545, $590,580).

Step-by-step explanation:

The information provided is:

$n=80\\\sigma=30,000\\\bar x=585062.50\\\text{Confidence level} = 90\%$

The critical value of z for 90% confidence level is, 1.645.

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$CI=\bar x\pm z_{\alpha/2}\cdot\frac{\sigma}{\sqrt{n}}\\\\=585062.50\pm 1.645\times\frac{30000}{\sqrt{80}}\\\\=585062.50\pm5517.50\\\\=(579545, 590580)$

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This interval implies that there is 90% probability that the true mean annual income of all company presidents is within this interval.

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